lkml.org 
[lkml]   [2005]   [Nov]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: duration of udelay differs with activated realtime-preempt patch?
    From
    Date
    On Fri, 2005-11-25 at 11:26 +0100, Schultheiss, Christoph wrote:
    > kernel: 2.6.14 with and without the realtime-preempt patch
    >
    > hi list,
    >
    > after measuring the duration of the function udelay (with oscilloscope
    > at parallel port), I figured out that udelay (5usec) with activated
    > realtime- preempt patch lasts a little bit longer. Without the patch the
    > time is exact.
    > All kernel debug switches are turned off at compile time.
    > Can anyone suggest why this happens?

    Well, the -rt patch, has changed the udelay function. BTW, you are
    using the constant udelay, right? Maybe an example of the code you used
    to test might be useful.

    Ingo or John?

    -- Steve


    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-11-25 14:31    [W:0.022 / U:31.500 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site